User`s guide

42(44)
Datum/Date Rev
Dokumentnr/DocumentnrUppgjord/Prepared
Dokansv/Godkänd - Doc respons/Approved Kontr/Checked Tillhör/Referens-File/Reference
99-07-15 G
268/155 34-ASB 150 02 Uen
FACILITY DESCRIPTION
Faktaansvarig - Subject responsible
SUPPLEMENTARY SERVICE
MULTIPLE SUBSCRIBER
NUMBER (MSN)
DEFINITION
The supplementary service MSN provides the
possibility to assign multiple ISDN numbers for a single
interface.
In ASB 150 02 this function is used for the S -Interface
in order to reach each ISDN terminal on the bus by
dialling its programmed MSN number.
USE
This feature allows a direct addressing of the ISDN
terminals or the ISDN interface.
OPERATION
Each S-Interface and each connected ISDN - terminal
supporting its own MSN requires a directory number in
ASB 150 02
These ISDN directory numbers will correspond to
route access numbers (see also chapter S-interface).
Incoming call to the S - interface
MSN is supported by the ISDN terminals on the
S - interface
Each ISDN terminal can be reached directly by dialling
its assigned MSN.
When the ISDN terminal answers the call, its
programmed MSN will be sent back as connected
number.
MSN is not supported by the terminals on the
S-interface or the use of MSN numbers isn’t
permitted by programming.
Only a global call can be initiated to the S-interface.
Each ISDN terminal compatible to the offered bearer
service can answer the call.
If MSNs are not permitted on the S-interface, and route
numbers as well as the terminals are programmed with
MSNs , the called party number will be discarded in
the call setup message and a global call will be
initiated.
Outgoing call from the S - interface
MSN is supported by the ISDN terminals on the
S-interface
If the MSN iis provided by the terminal, this number will
be used in the call setup message as the "calling
number".
If an ISDN terminal with a programmed MSN but with
no assigned directory number in the system initiates a
call, the calling party number will be discarded in the
call setup message, and the common directory
number of the S-interface will be used instead.
MSN is not supported by the ISDN terminal or the
use of MSNs is not permitted by programming.
If an ISDN terminal initiates a call and there is no MSN
available, the common directory number of the S-
Interface will be sent as the calling number.
If a terminal has a programmed MSN, but the
programming does not permit it, the calling
party number in the call-setup message will be
discarded and the common directory number of the S-
interface will be sent instead.